Name
ST_AsMARC21 — Returns geometry as a MARC21/XML record with a geographic datafield (034).
Synopsis
text ST_AsMARC21 ( geometry geom , text format='hdddmmss' );
Descripción
This function returns a MARC21/XML record with Coded Cartographic Mathematical Data representing the bounding box of a given geometry. The format parameter allows to encode the coordinates in subfields $d,$e,$f and $g in all formats supported by the MARC21/XML standard. Valid formats are:
-
cardinal direction, degrees, minutes and seconds (default):
hdddmmss -
decimal degrees with cardinal direction:
hddd.dddddd -
decimal degrees without cardinal direction:
ddd.dddddd -
decimal minutes with cardinal direction:
hdddmm.mmmm -
decimal minutes without cardinal direction:
dddmm.mmmm -
decimal seconds with cardinal direction:
hdddmmss.sss
The decimal sign may be also a comma, e.g. hdddmm,mmmm.
The precision of decimal formats can be limited by the number of characters after the decimal sign, e.g. hdddmm.mm for decimal minutes with a precision of two decimals.
This function ignores the Z and M dimensions.
LOC MARC21/XML versions supported:
Availability: 3.3.0
![[Note]](../images/note.png)
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This function does not support non lon/lat geometries, as they are not supported by the MARC21/XML standard (Coded Cartographic Mathematical Data). |
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The MARC21/XML Standard does not provide any means to annotate the spatial reference system for Coded Cartographic Mathematical Data, which means that this information will be lost after conversion to MARC21/XML. |
Ejemplos
Converting a POINT to MARC21/XML formatted as hdddmmss (default)
SELECT ST_AsMARC21('SRID=4326;POINT(-4.504289 54.253312)'::geometry);
st_asmarc21
-------------------------------------------------
<record xmlns="http://www.loc.gov/MARC21/slim">
<datafield tag="034" ind1="1" ind2=" ">
<subfield code="a"
>a</subfield>
<subfield code="d"
>W0043015</subfield>
<subfield code="e"
>W0043015</subfield>
<subfield code="f"
>N0541512</subfield>
<subfield code="g"
>N0541512</subfield>
</datafield>
</record>
Converting a POLYGON to MARC21/XML formatted in decimal degrees
SELECT ST_AsMARC21('SRID=4326;POLYGON((-4.5792388916015625 54.18172660239091,-4.56756591796875 54.196993557130355,-4.546623229980469 54.18313300502024,-4.5792388916015625 54.18172660239091))'::geometry,'hddd.dddd');
<record xmlns="http://www.loc.gov/MARC21/slim">
<datafield tag="034" ind1="1" ind2=" ">
<subfield code="a"
>a</subfield>
<subfield code="d"
>W004.5792</subfield>
<subfield code="e"
>W004.5466</subfield>
<subfield code="f"
>N054.1970</subfield>
<subfield code="g"
>N054.1817</subfield>
</datafield>
</record>
Converting a GEOMETRYCOLLECTION to MARC21/XML formatted in decimal minutes. The geometries order in the MARC21/XML output correspond to their order in the collection.
SELECT ST_AsMARC21('SRID=4326;GEOMETRYCOLLECTION(POLYGON((13.1 52.65,13.516666666666667 52.65,13.516666666666667 52.38333333333333,13.1 52.38333333333333,13.1 52.65)),POINT(-4.5 54.25))'::geometry,'hdddmm.mmmm');
st_asmarc21
-------------------------------------------------
<record xmlns="http://www.loc.gov/MARC21/slim">
<datafield tag="034" ind1="1" ind2=" ">
<subfield code="a"
>a</subfield>
<subfield code="d"
>E01307.0000</subfield>
<subfield code="e"
>E01331.0000</subfield>
<subfield code="f"
>N05240.0000</subfield>
<subfield code="g"
>N05224.0000</subfield>
</datafield>
<datafield tag="034" ind1="1" ind2=" ">
<subfield code="a"
>a</subfield>
<subfield code="d"
>W00430.0000</subfield>
<subfield code="e"
>W00430.0000</subfield>
<subfield code="f"
>N05415.0000</subfield>
<subfield code="g"
>N05415.0000</subfield>
</datafield>
</record>